WWE Hell in a Cell is a wrestling pay-per-view hosted by World Wrestling Entertainment. It takes place once a year, in October, and has since it was established in 2009. Around this time the company started introducing themed shows to their pay-per-view line-up. This particular show is based on one of WWE's most violent and controversial matches, of which the show is named after. At this event, the Hell in a Cell match is showcased. This type of contest is a no disqualification match with no count outs, where the ring surrounded by a 20 foot high steel structure. The only way to win the match is by pinfall or submission inside the ring. Before the pay-per-view event was established, The Hell in a Cell match was known as one of the WWE's most violent matches since its inception in 1997. These types of matches were known to feature blood and dangerous stunts that took place inside, outside, and on top of the structure. However, the matches have not been as violent since the Hell in a Cell show began. Around that time the company decided to go into a PG direction. Each event has hosted anywhere from one to three Hell in a Cell matches. Only the high profile matches are contested in this type of match. These main event matches have typically been for the World Heavyweight Championship and the WWE Championship; although other bouts have been contested in the 20 foot steel structure that surrounds the ring.